Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f8bc9914538534…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 07:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bb6300b4d2b1fa54c2fa19ce2f191d09 SHA-1: 451e88b33f0bffb040a592851b96bbf140eaab78 SHA-256: 87f8bc99145385342502f911323fa4902dc3cbda7d462902fd5baccf53db4444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=guidelines+meaning+pdf PDF link annotation
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/facd3bd2d6e83644e0ca048834949372/54282556537.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7f95db369019ae40406898998fed4034/fakemawapovumoxaxugepa.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/2097121003.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/88410372923.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/54640831422.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/663de5c4699fc5cdab404736121c879b/79492904363.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/1484546179.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/wuvelowekumakajaziv.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/netudipujozorazibofu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1dc48c593---sekiz.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f02d4033861133f551d6aad44226d57a/basugibosat.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/87574301908.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2d0415c7a79a72005aeeb8d0b6465147/tazaxog.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/94133287733.pdfIn PDF document text
    • https://funke.be/data/file/selutogamu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d07627768---83755235325.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20189003362.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/rafolu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/32053673062.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/84634953159.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/wabagojeluwibuba.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/56886646588.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8c52654b97918e11bf8169767955e2f0/sekemaniraz.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/nokepopozidox.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 18516 bytes
SHA-256: a0b6665ef71754fa711bd4a1fdff694cd0589ea6b23e607b8a2c10d9134fbe6d
font_01_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 10660 bytes
SHA-256: 038b1453f95f517c0ee63318fdb9158f0e3d559c7d78c975802ee395411793d0
font_02_sfnt_off0001305c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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